South32 exits aluminium assets with $5.6 billion sale to Alcoa

South32, a globally diversified mining and metals company, is exiting the aluminium value chain in a deal worth up to $5.6 billion, marking one of the biggest portfolio reshuffles in the global mining sector this year.

The agreement will see Alcoa Corporation acquire South32’s stakes in Worsley Alumina, Hillside Aluminium and several Brazilian alumina and aluminium operations, creating one of the world’s largest integrated aluminium supply chains.

Deal reshapes South32 portfolio

The transaction carries an implied enterprise value of up to $5.6 billion, including $3.1 billion in cash, $1 billion in Alcoa shares, approximately $750 million in assumed debt and lease liabilities, and up to $750 million in additional payments linked to aluminium and alumina prices through 2030.

The assets changing hands include South32’s 86% interest in Worsley Alumina, full ownership of Hillside Aluminium, a 33% stake in MRN bauxite operations, a 36% interest in the Brazil Alumina refinery and a 40% holding in the Brazil Aluminium smelter.

South32 shareholders are expected to receive an initial return of about $500 million through an in-specie distribution and special dividend, with additional capital returns under consideration after the transaction closes. Mozal Aluminium in Mozambique remains outside the transaction and continues under care and maintenance while strategic options are evaluated.

Pivot toward copper and zinc growth

Former South32 Chief Executive Officer Graham Kerr said the deal unlocks shareholder value while repositioning the miner as an upstream base-metals company focused on higher-margin commodities.

Following completion, around 85% of South32’s earnings before interest, taxes, depreciation and amortisation are expected to come from copper, zinc, silver and lead, reflecting growing global demand linked to electrification, renewable energy and infrastructure investment.

The streamlined portfolio is also expected to lower annual corporate overhead costs by approximately $125 million, with the full benefits forecast to be realised by the 2029 financial year.

Alcoa strengthens global aluminium leadership

For Alcoa, a US-based global leader in the production of bauxite, alumina, and aluminum, the acquisition significantly expands access to bauxite, alumina and aluminium production assets across Australia, Brazil and Southern Africa.

The company is already the world’s largest third-party alumina producer and supplies aluminium products to sectors including aerospace, automotive, construction and packaging.

South32 is a globally diversified mining and metals producer headquartered in Perth, Australia, supplying critical minerals including aluminium, copper, silver, zinc and manganese to global markets. The miner operates major assets across Australia, Southern Africa and the Americas.

Listed on the Johannesburg Stock Exchange (JSE) and the Australian Securities Exchange (ASX), South32 is a leading manganese producer through its operations in Australia, including GEMCO, and South Africa.

The deal underscores a broader trend across the global mining industry as producers simplify portfolios and increase exposure to metals expected to benefit from the energy transition.